Exactly what did you do to add the 1099R? The only way to add it correctly would be to wait for the return to be accepted or rejected. If it was rejected you could add the 1099R and re-file. If the return was accepted, then you have to wait for it to be fully processed and prepare an amended return on Form 1040X to add the 1099R. If you just went into the software while your e-file was still in "pending" the change you made went nowhere and may have messed up your return. Remove it if you can.
You have to amend by working from the return exactly as it looked when originally e-filed.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
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