I found the cause of the PHP error. The host has it set at PHP 7.2.34, but it has been 7.3. The simple certificate will fail, produce a PHP error, won't issue, if the text in the Certificate Name in settings is too long. There may have also been characters in there that it didn't like. Example:
4. Click Here for Your Property Management III Continuing Education Certificate (must have had access/logged into site (first access/check by clicking on your name on top right) at least 9 hours before this certificate is available) -fails.
4. Click Here for Your Property Management III Continuing Education Certificate - generates
4. Click Here for Your Property Management III Continuing Education Certificate (must have had access/logged into site (first access/check by clicking on your name on top right) at least 9 hours before this certificate is available) -fails.
4. Click Here for Your Property Management III Continuing Education Certificate - generates