Deductions & credits

Use the Chrome browser on a computer.  Go to settings and clear browsing data for all time.  Then log on to TurboTax.

Try this workaround for the $300 Charity to add to your standard deduction.

This was an known issue that has now been resolved.  Here are the steps to correct it
 

1. Click Deductions and Credits
2. Select Review/Edit
3. Click Edit to the right of Standard Deduction

​​Click OK, Sounds Good

1. Click Wrap Up Tax Breaks
2. Click Continue
3. Make sure that $300 is filled in and then click Continue
4. Click Lets Keep Going

If still an error is the work around for claiming the $300 Charity Deduction:

1. In TurboTax select Federal in the panel on the left
2. Select Deductions & Credits at the top of the page
3. Under Your Tax Breaks - Charitable Donations 
4. Click START to the right of Donations to Charity in 2020
5. Click YES
6. Click ADD next to Money
7. Type in the name of the charity that you donated to
8. Type the amount of the donation
9. Select Done with Donation
10. Select Done

Now the $300 will appear on Line 10B and in the Charitable Contributions screen