Hi @Axel ,
Thanks for your post and apologies for the delayed reply!
The Sign-on URL/Home page URL is different from the Reply URL and is specified on the app registration's "Branding" page in the "Home page URL" field. Based on the error message it sounds like it is missing from your registration, or there is a mismatch between the app registration configuration and a reference in the app itself. You can set that URL in the Branding section here:
Let me know if this helps or if you still face this issue.
-
If the information helped you, please Accept the answer. This will help us and other community members as well.