Schedule 2 has a tax amount on line 8. I did not have this last year so I need to know what is it and how was is it calculated

The tax software apparently thinks you didn't take the RMD amounts form all your pension, 401k, and IRA distributions.  (All 1099-R forms once you reach age 73 have an RMD...even if a fixed pension).

Lots of confusion over it this year due to the way TTX has been asking follow-up questions.

Edit every 1099-R you received

Yes. flat pensions have an RMD...indicate all of it is the RMD and you don't have to calculate it....the amount was pre-determined.

IRA's can apparently get more difficult if you have multiple 1099-R forms for actual IRAs...or if you did some form of rollover during the year for one or more of them.   If you are sure you took the proper RMD from your IRAs, (and didn't do any rollovers...and didn't do any QCD distributions) just indicate the amount distributed was all an RMD.

If more complex than that, then it depends on the situation, and someone else may need to take over.