Thanks for reporting. I suspect the underlying cause of this problem was the same as reported in https://forum.inaturalist.org/t/my-url-for-species-to-identify-stopped-working/74425/12. We have since deployed a fix for that. Could folks please retry generating their year in review and see if you continue to have problems?
If this was the cause, that change was deployed less than 24 hours ago so I would expect that would only be responsible for problems in the last day or so. @SteveMcBill you report having problems for more than 3 days. I’d be interested to hear if you are still experiencing problems. If so, would you be willing to share your iNaturalist username here or with me privately so we can further investigate? Thanks folks and apologies for the issues