Bulgarian mailbox website - abv.bg does not log in from mobile iOS

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Description of the issue:
Website abv.bg is a national Bulgarian website e-mail domain that millions of users use for email communication. When trying to log in from my iPhone (mobile version) it does not log in but refreshes the page after you enter your credentials and click the login button. It does the same thing all the time, it remains on the same main page and constantly pops up the cookie request.
The issue is not observed on desktops/laptops such as MacOS laptop (Macbook), or Windows supported laptop.

How can this issue be reproduced?

  1. Go to https://m.abv.bg/index.html from iPhone (any version has been tried for the last year)
  2. Fill in your credentials (You must have an account)
  3. Click to log in
  4. You will be refreshed and will not be allowed in your mailbox

Expected result:
The expected result is to be able to log in. The issue is not present on the laptop.

Brave Version( check About Brave):
Any version for a while now. I have tried it for over a year and still the same.

Mobile Device details
Same story for iPhone 6s, iPhone XR, iPhone 12 Pro Max and iPhone 13. Probably since iOS version 10 or around there.

Additional Information:
It used to have a workaround when you change to the desktop version and it gets through. But now (latest Brave version and iPhone 12 Pro Max iOS 15.1.1 it does not allow to change to Desktop Version at all - that might be a new issue).

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