HELP - Error with removing phone number

[Swaixtrix]

Hello

I need help.
I cant remove my phone number in Dota2.
Soon i will have a new number thats why i want to update the "old" one.

When i go to "Settings" - "Account" - "Remove Associated Phone" i receive the following error over and over again: "Uknown error occurred during phone removal."

I've already reinstalled Dota2.
I even have freshly installed windows on the pc.
But the error occurs everytime.

Steam Support told me that it is a visual bug.
But thats not a visual bug because i am still able to play rianked games.

Did someone had this problem too and could solve this?

Thanks in advance.

Best regards

[Swaixtrix]

Update - Message from Steam Support:
Message from Steam Support on Sep 16 @ 8:35am | 8 hours ago
Hello,

Thank you for contacting Steam Support.

At this time there is no need to have a phone number linked to your Dota 2 account to play Rank matches.

Also, at the moment there is no Phone number linked to your Dota 2, and like I said previous, there is no need anymore.

So you can please ignore the error, we are aware and our team is trying to fix it.

Steam Support
Miguel

Is this a joke?