You’ll need to wait for up to 30 minutes till they change properly on the cpanel.
Because it tries to login with your cpanel password. it will redirect to mysql login page cuz it is invalid. and the login page will redirect to the mysql panel with the invalid password. It will create infinite redirecting loop and this error will display, It is only my opinion,
After waiting the supposed password synchronization, I am still not able to connect to the database neither with my MySql Workbench (I read it depends on the account upgrading) nor your phpMyAdmin, due the same problem.
Why I can not connect the phpMyAdmin from the cpanel? (“too many redirects” error).
What has been the sin? to change my password?
I can not get my application working properly because of this matter (the beggining), and I really can’t waste much more time with this issue. After this, I suspect that getting the mail service well configured to send emails will forces me to spend an extra time again.
Unfortunately, if there is no progress in a couple of hours, I will decide to move to another place and start with a new provider, having lost a lot of time here.