I spent days trying to figure it out with the Shopify support and they did
not have any luck either. I tried clearing cache, cleared cookies, logging
put, logging in, I deleted the browsers and reinstalled. Tried Chrome,
Firefox, safari, brave and even tor browsers and nothing worked. I even
tried using my Samsung cellphone to work, and same thing. I just kept going
in circles unable to get anything done with a login loop.
Yesterday though!! My ipad decided to update itself to the new iPadOS
16.6.1, and I have not been looped since. WHY that helped, I don’t know.
Especially since logging in on my phone didn’t work either, so I don’t
know. So if you’re using an apple product, maybe try updating. Otherwise,
like you i kept re- logging in and for a short while was fine, then that
stopped working and I just kept going in circles and logging back in was no
help at all. Sad face.
Good luck to you. I hope you get your loop unlooped and can get back to
work soon!