auth_num = response_json["uuid"]
invoice_link = f"https://report.feel.com.gt/ingfacereport/ingfacereport_documento?uuid={auth_num}"
message = f"Watch invoice"
invoice.message_post(
body=message,
author_id=self.env.ref("base.partner_root").id,
subject="Certified Invoice",
message_type="comment",
subtype_xmlid="mail.mt_comment"
)
My code is not interpreted correctly, as my message does post to the chatter, but the link is seen as plain text and not as a link.

Did you solve this? I got the same problem.
Same issue here.
I am using a webhook to create a log message in the chatter