Hi joanneszemborsk,
Please follow the steps provided in the TR8620a's manual here:
TR8600 series > Frequently Asked Questions > Faxing Problems > Problems Sending Faxes
If you continue to have difficulties, please contact one of Canon's Technical Support Representatives via phone or chat. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TR8620a and then click on the Product Support button. When that page loads, click on either the Phone Support button or the Chat Support button to access support.
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