i2501 >>> 401 >>> i2501 again...

Hello dear reader! Perhaps some of you have encountered something similar. I really need your help. I recently purchased the game. Now the mog shop is having a sale until the 5th, I wanted to buy a couple of expensive items, but I ran into a serious problem. Since my game is tied to steam and I thought I would make all my purchases through it, I added items to the cart, selected a character, and when I was about to pay, I got error i2501. For the next 3 days I couldn't buy anything. I read various guides and advice on the Internet, installed and uninstalled chrome and mozila browsers. I tried incognito modes, cleared the history, turned on and off proxies, VPN and other tips. I waited 24 hours, after which a 401 error appeared. After that, I tried again to enter the payment window via Steam, but error i2501 appeared again! Technical support does not respond, I received an automatic notification that they were looking into my issue. The support chat did not help, they said that they sent the request to someone there. Discounts are ending soon and I'm afraid that the problem will not be solved during this period. Help me please T_T I've already tried everything
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Good morning! Thank you for posting in the Final Fantasy XIV Technical Support Forums.

Unfortunately, the issue you are describing is something we are not able to assist with in the Technical Support Forums. As the account in question is European in region, we advise to continuing to contact the European Support Center. This thread will be moved to the 'Separate Support Required’ subforum as contact with the Square Enix Support Center is necessary to resolve the issue.

This thread will be moved to ‘Separate Support Required’, thank you once again for visiting the Final Fantasy XIV Technical Support Forums!