kamilcz

Yes, no difference. I had it correctly set in my azure

Trouble is, it both goes to 404. I can only log in (or try) frow /wp-admin page using button. The button has following link https://xxx.xx/wp/?sso_for_azure_ad=start&redirect_to=https%3A%2F%2Fxxx.xx%2Fwp%2Fwp-admin%2F
It redirects me to microsoft where I can log to my account but returning fails on 404. Rewrite works normally with pages and posts. I can give you access to my dev evironment so you can try yourself if it helps

I see just 404 and I am not logged in

Thank you, seems like there is further issue. Now it allowed me to go through with login until it redirected me to ?code=M.R3_BL2.8c56af13-bb21-1356-5a71-36426c3c60b1&state={“redirect_to”:”https:\/\/xxxxxx.xx\/wp-admin\/”%2c”nonce”:”cb481d5f74″}

Seems like I am still missing something

Sorry for late response. Somehow I didn’t get notification.
Sadly I can’t I am no longer working on that website. But you can easily recreate the issue. Try clean WP + theme with full site editing (I used Hello gutenify from WP repo) + your plugin. Then edit header/footer and add any of your gutenberg widgets. If you want I can create some clean site for you if that is the issue.