Had an issue raised to me by a site owner yesterday as they were having issues with the Coupon add-on – if they switched it on, it appeared to be on, however, on next admin page load it was deactivated. This was using V18.104.22.168
On investigating I saw the new version was out, upgraded to V22.214.171.124 which seemed to resolve the add-on issue, however, at this point I was no longer able to login to the site through any M2P login page. Logging in would redirect to /login/ which was presenting a 404 page.
I’ve since rolled back to V126.96.36.199 and everything seems to be working fine again.
Let me know if you can’t replicate these and I’ll try and set something up my side.