Yes, you can Efile your 2022 Amended Return.
Since you have up to three years to file an Amended Return, you can wait a bit to Efile your Amendment.
There may possibly be a reason you would not be able to Efile an Amended 2022 return, but not because the Efile window has closed. Actually, Efile officially opens on 1/29/2024 this year, so you could try again after that date.
If you were able to Efile your original return, and then added a particular form to your Amended Return, you may not be able to Efile your amendment. Since we can't see your return in this forum, we wouldn't know that (unless your 'Unable to Efile' message has some details).
Here's more info on Can I Efile My Amended Return?
@jrm-tx
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