Why aren't the Form 2210 and CA underpayment of estimated tax ready? I can't file the return and it looks like only paper file is available.

[lizshh]

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It looks like some of your tax forms aren't ready
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Form Available to File
Federal Forms
Form 2210 no date provided
Underpayment of Estimated Tax 02/25/2021

What does this mean?

[DaraLO]

Form CA 5805, Underpayment of Estimated Tax by Individuals and Fiduciaries, is ready for e-file.  IRS Form 2210, however, is not yet ready for filing.  This form will be available in TurboTax Online on 02/25/2021.

You can proceed with either printing and mailing, or e-filing your return, once this form becomes available.

Additional Resources: 

State forms availability table for TurboTax individual (personal) tax products

IRS forms availability table for TurboTax individual (personal) tax products