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Issues with "TLS certificate verification failed" errors should check for and delete expired R3 cert from LetsEncrypt.
Windows users:
1. Open Run and type mmc.exe
2. Select <File>, <Add/Remove Snap-In..>
3. Choose <Certificates>
4. Select <My User Account>, and click<OK>
5. Expand <Certificates - Current User>
6. Expand <Intermediate Certificate Authorities>, and Click <Certificates>
7. Find the expired R3 and delete it.
NZBGet specific information can be found at https://nzbget.com/documentation/choosing-cipher/.