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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 (convert2rhel 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/RHEA-2021:3832

Of note the link https://access.redhat.com/errata/RHEA-2021:3832 is broken.

On another note, since this is a super common scenario I would hope an automated fix would be made to convert2rhel

I'm sorry that the advisory link does not work, we're working on fixing it.

The new convert2rhel version 0.24-2 (available already under https://cdn.redhat.com/content/public/convert2rhel/) allows an automated conversion of UEFI-based systems, however this new capability is available only when converting to RHEL 7 and 8, not to RHEL 6.