Hi,
So indeed i had time to:
1.Install both package from repo, rename and symlink it to the new packages. No success, same error.
2.Compile and symlink to the newest lasso version 2.8.0. No success, same error.
3.Open a support ticket with lasso which can be found here: Support #74121: Lasso Error 400 while receiving SAML response from AzureAD - Lasso - Redmine Entr'ouvert
Would really appreciate if you could try it on your 9.1 based box in order to reproduce this issue.
Btw it makes possibly only sense if your IdP is AzureAD or Google Workspace IdP as mentioned in the other Github thread.
Br,
Fred