Lexmark XC6153
Use envelopes that have been stored in a dry environment.
Note: Printing on envelopes with high moisture content can seal the flaps.
Resend the print job.
Does the envelope seal when printing?
Contact customer support.
The problem is solved.
Watermarks are not appearing when printing from Google Chrome and Microsoft Edge
Downtime Assistant ‑ Internal error in Web Application when printing file