Re: "Hello Apple Support",
Welcome to this Apple (user-to-user) Community!
However, Apple Support is not here, and unlikely to see your question.
Sorry to disappoint, yet we are all Apple users, just as you are, in this community. We do what we can to assist each other, and those with expertise are often great at sharing their experience. Many of us enjoy volunteering time and effort to help troubleshoot.
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Re: "Recurring agreement acceptance loop in Apple Books for Authors"
Am no expert in this area, yet your question deserves some response.
Seems Apple has discontinued Apple Books for Authors. (People with older software installed may (or may not ?) still be able to use it, if already installed.). So it's not surprising that you were unable to proceed with the agreement.
About: Transition from iBooks Author to Pages - Apple Support
The way I understand it, Pages app is now the up-to-date Book publishing app. If not already on your Mac: Apple Pages app is free to download from the App Store.
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About the app:
More info: (+ download link at top right) Pages - Official Apple Support
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Resource:
How to: Publish a book to Apple Books in Pages on Mac - Apple Support Eg: says: "You can use Pages to save your book as an EPUB file, with cover art and formatting optimised for publishing on Apple Books."
Pages User Guide for Mac - Apple Support
You can click the "Table of Contents" on the Welcome page, to view
various topics, leading to detailed "how to" info., or use the search field.
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For Contact with Apple Support:
- You can click the "Support" link at top right or bottom left on this discussion page.
- (You can reach out to Support staff on the Pages Support website:
(There's a "Get support - start now" link near the bottom)
Pages - Official Apple Support
- Apple phone numbers around the world:
(Scroll down to "Connect with Live Support" to choose your country)
See: Contact Apple Support - Apple Support
All the best :-)