For those having log in issue, you can try either SF clear cookies option, or find the SF cache folder and delete the entire folder. See if one or both work.
Other than that, I have no access to canalplus.com so can’t say what might be going on.
Like SF 6 boasted, SF 7 also boasted importing cookies or logins from browsers and never fulfilled that.
I had problems in the past with Netflix, and it’s sounds crazy but turned on a VPN to a different location still in the USA and was able to log in. Not saying that will help for canalplus, but never know. Other than that, need more people with access to canalplus to help.
And maybe someone can delete their streamfab.log then try to log in and post a log, it might help, you never know?
Screenshots may also help.