This will probably be highly unpopular at nowiki but the site id and the subdomain should be changed. Correct site id would be nbwiki and subdomain would be nb.
The discussion on T19047 is pretty descriptive, situation is very hostile, but what oddeivind said is correct. The no code covers both nband nn but nowiki only supports nb. Riksmål is not an official language form and has virtually gone out of use, even if some users at nowiki claim they use it. Close scrutiny of what they write onsite makes it very clear that they do not write Riksmål, they write whats called "moderate Bokmål".
This request is only for change of nowiki, possibly only the subdomain as that is the primary cause for the continued fighting between nnwiki and nowiki.
The project nowikinews is a dead and should be closed. People from both nnwiki and nowiki tried to get it going, and a lot of templates and other onsite structures was built to support both Nynorsk and Bokmål. After a while people started to disagree and the project become quite hostile. Now it is mostly just trolling going on there. Closing it is another issue, and should not be discussed here.
Projects that are alive and use both Bokmål and Nynorsk could continue using the no subdomain, but projects that only use Bokmål should use nb.
Sometimes I hear the argument that the no subdomain should be retained because it is the country code, but that is an error. It is like saying svwiki should continue to use se because it is the country code. Now sewiki is the Sami language wiki.
Please be advised, there is no consensus at nowiki for this change and earlier discussions has always "landed" on "remain at nowiki". The last big vote we did on this was in 2009 with a clear result for "stay at the no-prefix". Please see https://no.wikipedia.org/wiki/Wikipedia:Avstemninger/Prefiks for that vote. Since then nothing new has happened really and every new flare-up of "let's change no to nb" has been quenched:
The OP's sudden need to expedite a change without any consensus or community-backed effort is really out of order. If and when we decide to go forth with requesting a prefix-change, it will be backed by the community either by consensus or a vote.
This is not something nowiki can decide on alone, it is a misrepresentation of what the subdomain should contain. The code no is simply not correct, and whether people from nowiki claim something else does not make that claim any more correct. (Argumentum ad populum) There are two projects with to language codes, and one of them imply that the site includes the other, which it doesn't do.
The code no should either be used as a common portal of some kind, or not be used at all, and nowiki should be moved to nb.wikipedia.org.
Given the uncertainty here around who needs to agree to such a thing, I'm going to add the tag. And given the multi-site nature of the issue it most likely needs a discussion on meta involving enough people from each site.
This is one of the most discussed topics on no.wikipedia.org and the community has rejected this proposal formally with a overwelmingly vote to stay at no (no consensus, achieved) back in 2009 https://no.wikipedia.org/wiki/Wikipedia:Avstemninger/Prefiks, it surfaced again in 2011 https://no.wikipedia.org/wiki/Wikipedia:Tinget/Arkiv/2011-35#no._vs._nb. In the current notification of this issue at no.wikipedia.org's deciding organ https://no.wikipedia.org/wiki/Wikipedia:Tinget#Flytting_av_nowiki.3F there is a strong opposition to go on with this old and resolved discussion to avoid more noise. Please close this request since there are no fundamentally new issues as per https://no.wikipedia.org/wiki/Bruker:Nsaa/Prefiks#Nei_til_flytting_fra_nowiki_til_nbwiki (the Meta request to move do not handle nearly any of these issues to keep it at no raised back in 2009). ~~~~
nowiki at https://no.wikipedia.org/wiki/Wikipedia:Tinget manage no.wikipedia.org and that is NOT wrong. A more detailed response to this here https://meta.wikimedia.org/w/index.php?title=Talk:Requests_for_comment/Rename_no.wikipedia_to_nb.wikipedia&diff=prev&oldid=15960603
There are three projects that has a legitimate use of the no-code as they are bilingual; Wikinews (n:Wikinytt:Målnøytralitet-nb), Wikibooks (b:Wikibøker:Språkform), and Wikisource (s:Wikikilden:Hva er Wikikilden?#Språk og oversettelser).
As an administrator at Nynorsk Wikipedia I highly agree on this change.
This is correct according to all official registers.
According to Profors at https://nb.wikipedia.org/w/index.php?title=Wikipedia:Torget&oldid=17735096 A Redirect from no to nb is necessary. When this is done, all current functionality will continue to work. (as the redirect from nb to no works today).
The most important issue right now is the Interwiki in WikiData to change from no: to nb:.
Disclaimer: I'm writing this as a Nynorsk Wikiepda Wikipedian and Administrator. I'm Hogne Neteland, also chair of Wikimedia Norway, but this issue is not discussed in the Board nor the Organisation, and therefore this is not anything I can argue for as chair!
There has been a new, and quite confusing vote at nowiki. It can be found at Ny avstemming om nb.wikipedia.org (New voting about nb.wikipedia.org) and the outcome at Avstemning (nb/no) (Voting (nb/no)) with an actual outcome of 23 for the change and 9 against. Three users have publicly abstained from casting a vote.
I believe the change is no longer blocked by the earlier voting from 2009.