What was the exact error message you are seeing?
Can I just confirm:
- You have no returns saved for the same period?
- The correct HMRC account has been connected?
- You have successfully enrolled for MTD with HMRC and received confirmation?
- When you try to submit a MTD return (after you select the period), the “File electronically to HMRC box” is ticked?
If it’s easier, we can send you a private message, get some account details from you and take a look for you?
There are no issues on our end of things, although as mentioned above, there have been one or two issues on HMRC’s side today which may be affecting it.