Yes we are using only one LocalSettings.php. we have only one instance of MW (website) and both urls points to same(as said previously one url is custom domain)

Just assigned values to $wgserver in LocalSettings.php

Defined the wiki.internal.domain.com as relative url in $wgServer in LocalSettings.php file. also IdP reply url configured as wiki.internal.domain.com

here is the step which is working with MW 1.26 where as not working with MW 1.27 and above

For the below one, I just took only the config.php from 1.11 and replaced on 1.17.4 as the recent one missing some of the configuration like "session.phpsession.domain". Getting no state error when use the 1.11 simplesamlphp with MW1.32.

> Let me restate to be sure that I understand your response. You configured your 1.32 MediaWikiPluggableAuth/SimpleSAMLphp to use the older 1.11 simpleSAMLphp library and updated values of store.type and session.cookie.name. With that, you could authenticate correctly from wiki.internal.domain.com, but from wiki.domain.com you got a blank page at Special:PluggableAuthLogin although you were authenticated. This is the same behavior that you had with the 1.17.4 simpleSAMLphp library. Is that correct?

Tried with simplesaml config from 1.26 (working one) and internal wiki is going infinite loop during authentication with AAD App Id. This is because of session.cookie.name (wiki_session) and modified to wikitest_session which resolved the infinite loop issue. So I understand the MW is creating the session by default and using the dbname (wiki) for sesssion name (my understanding). as per my understanding MW is not taking the session name from simplesamlphp configuration.
With 1.26 config the external wiki not working in MW 1.32/1.33

Simplesamlphp configuration (not working) version : 1.17.4
PluggableAuth : 5.7
Simplesaml configuration (working) version :1.11

Version details for non working (upgraded to 1.33 when it was not working with 1.32)

Imagelinks fix I do not see in the mw v 1.32.2 and manually applied the fix to SQL file for Image, template and page links

sorry pasted wrong error. here is the error I got when running DB upgrade script

Any fix for this one? I too getting same error when upgrade mw from 1.29 to 1.32