Deactivate Youser for now.
Get a basic BP install working first.
Walk thru the Configure guide and the Admin guide instructions in the codex.
Resave your permalinks after choosing any option other than the default option.
I’m not saying that it will solve all your issues, but it will get you on the right track.
I am on the right track now. I found out that Peepso shortcode was still in pages named the same as BP pages. So I deleted them all and made new ones for BP and they all are non peepso now.
For the Groups issue, it is still happening though, even after deleting permanently the Groups page (in case attache din anyway with Peepso).
All users are still marked as spammers. If i have to re enter them manually I will.
I will have to try the register process now as it did not work before.
Are you able to help with these remaining issues?
Youzer got back to me and is logging in now to help with remaining issues. I will get back to you if it does not work out.