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This bug was initially created as a copy of Bug #2068192

I am copying this bug because: 
The same problem exists on RHEL-8.


Description of problem:
When the user registers to CDN in anaconda GUI and then tries to unregister, the "Unregister" button is sensitive after the first unregister attempt. When the button is clicked again, the UI becomes unresponsive.

Version-Release number of selected component (if applicable):
RHEL-8.6.0-20220323.1
anaconda-33.16.6.7-1.el8

How reproducible:
Always

Steps to Reproduce:
1. Start graphical installation.
2. Proceed to the Connect to Red Hat spoke.
3. Register to CDN and stay on the spoke.
4. Click the Unregister button twice while the system is unregisterring.

Actual results:
Anaconda UI becomes unresponsive.

Expected results:
The "Unregister" button becomes insensitive after the first click.

PR: https://github.com/rhinstaller/anaconda/pull/4234

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (anaconda bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7462