For anybody here in future. Ran into same issue. I had new year of membership & had already accepted agreement in apple.developer.
For some reason navigating to devices > removing any unused devices seemed to fix my issue & allowed me to accept the agreement in app store connect. Essentially, fix the banner in your devices section & it updated my banner in the agreements section to allow me to actually review.
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Was granted for main application in only 2 days. Didn't realize extensions each needed their own submissions.
Now at 10+ days with no word back on extension approvals. Just word of caution for others to submit extensions at same time as main application.