Hey there, Robin.
Let me point you in the right direction and guide you on Integrating Fathom with your QuickBooks Online (QBO) account.
I suggest checking the email you received for details on the requirements. If you can't find the information you need, I recommend reaching out to Fathom's customer support. They have the tools to access your account's information, figure out the reason for rejection, and help you correct the integration securely.
For future reference, check out this article if you need to transfer app ownership or disconnect it: App ownership and disconnecting apps.
The Community is always open if you need further assistance in integrating Fathom with QBO. Just comment on this thread, and I'll get back to you shortly. Take care!
