Why can't I efile. it states that i am not entitled because of one or more formsets. Please explained. Same forms used every year.

[Kat]

This is a known issue that TurboTax is investigating.  In the meantime, see the answer below posted by one of the TurboTax Moderators with possible "fixes".

I get the message "not entitled to efile one of more formsets". 

Please troubleshoot with the options below. If needed, we will need to investigate your experience.
 Thank you for your participation and patience. 

a. Check Availability
 Please confirm all forms you are filing are available and supported to be e-filed. When will my forms be ready?

(The 8915-E Form is projected to be e-fileable starting 02/24/2021)

b. Remove state and try again
 If all your forms are ready and available to be e-filed and you receive this message, please follow the steps below

1. Sign out of TurboTax.
2. Sign back in.
3. E-file the return again.

You may need to remove your state and prepare your state return again to move past the error and successfully e-file

c. Send us your tax file
Still receiving the message? We'd like to take a deeper look at your specific situation. Please attach screenshots, detailed instructions on where you are in the TurboTax Program and a token number. (This token number gives us your tax file with all your personal information removed)

TurboTax Online:  
Click Tax Tools in the menu to the left.
Click Tools, and then
Click Share my file with Agent.
A pop-up message will appear. Click OK to send the sanitized diagnostic copy to us.
Provide the token number that is generated onto this thread.

TurboTax Desktop:
Select Online menu if the customer is using Windows. Select “Help” if using a Mac.
Select Send Tax File to Agent.
A pop-up message will appear, and the customer will select, Send. If using Mac "Send Tax File to TurboTax Agent" 
Note: Desktop will save a file to your computer unless you uncheck the box.
Another message will appear. Provide the token number that is generated onto this thread.

[Anonymous]

I am also encountering this issue. I've double checked and all of my forms are available and supported. I followed the advice above from @Kat  to remove the state return, re-did it, and now want to try filing again. But I'm now being prompted to pay again when I paid during the first attempt. I don't see a way around having to pay a second time. This is a mess.

I sent my return to an agent and ref number is 749332.