Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, re-confirm and post back if this is with an HP Officejet Pro 8610.
And would the "...change my fax number..." be the FAX Number as it appears in the fax header printed
Of course; still, please try first:
Post back how things turned up and/or should additional information be needed.