After seeing the work someone else did with migrating your subscriptions across accounts. I took their code and expanded upon it to fully synchronize your Lemmy instance accounts.
Feel free to give it a try. It’s been useful for me to have accounts in multiple instances with the instability problems right now from the big influx of users.
Let me know what you think. Hopefully it can help a few people.
Without the actual error message, it is nearly impossible to help.
But, it sounds like you have an earlier Python 3 version that doesn’t support advanced type hints. Installing Python 3.8.x and trying again might help.
Again, without the actual error message this is a complete shot in the dark.