I added three wild card sub domain to same server IP and try to add the SSL. It worked for few hours but after that it again stopped and giving a connection error. So please help me

Help
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I tried command from below URL -

Now working fine. But I am not getting that why I am unable to run the https URL for any sub domain like https://ffdf.mytaxlogin.com/

OR may be I missing something that step is also required. So please let me know if anything is missed.