Instagram's username is not changed

Hello to everyone.
I have an Instagram profile that yesterday has been two weeks since the username was changed. I'm trying to change it again today but I do not understand why instagram does not save it when I save it. Has this happened to you too? Please help me with this problem.


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instagram
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instagram problem
make money with instagram

This has happened to me in the past. Do the following:
1. Create a fake Instagram account by using Tempmail or Tutanota.
2. Now transfer the Instagram name you have on your original account to the fake ones including the email address
3. Confirm the email address by visiting your inbox in Tempmail or Tutanota.
4. Now, try to change your Instagram username on your original account. Hopefully, this will help. At least, it did for me.