If L-alt was bound before the update it can cause your perks to get stuck with a “perks not bound” error.
Rebinding it to a different key won’t fix the issue.
I had L-alt bound to a voiceline since OW1. It shows that it is bound in the comms wheel but not in the settings.
The only way to unbind it was by restoring defaults in the controls tab. Then you can bind perks without issue.
Hope this helps people that still have this issue.