On https://acrobat.adobe.com/link/signatures, I attempted to reassign an email incorrectly sent to [name]@[address].com, which should have been sent to [name]@[address].co, but I was unable to do so. I believe the data validation for URLs or at least TLDs is matching partial strings, rather than exact matches, causing this behavior.

Steps to reproduce:
Assign document to email of format [name]@[address].com
Send for signature
Click 'Replace recipient' and enter email of format [name]@[address].co
Click Confirm

Environment:
Mac OS 12.0.1, Chrome 99.0.4844.51

Expected result:
The document signature fields are reassigned to the correct email address.

Instead got:
Error message that was something like "cannot reassign to someone who is already a signatory to this document".