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Sync between desktop and iphone not working

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I have been attempting for two days to sync my Firefox desktop info (for the bookmarks) to my iphone, and it keeps coming up with a 500 error - see attached.

Please advise as I'd like to have my bookmarks the same in all places. I have an iPhone 11, and as far as I know all versions of Firefox in both places are up-to-date.

Thank you.

I have been attempting for two days to sync my Firefox desktop info (for the bookmarks) to my iphone, and it keeps coming up with a 500 error - see attached. Please advise as I'd like to have my bookmarks the same in all places. I have an iPhone 11, and as far as I know all versions of Firefox in both places are up-to-date. Thank you.
Attached screenshots