SSL/TLS For Local Domain Not Resolving

Hello Shahn,
It seems that there are problems…I get what appears half-right, half timeout so unable to verify. Not sure what all that means and why. Are there any ideas?

depth=0 CN = nollivoipserver.nollicomm.net
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = nollivoipserver.nollicomm.net
verify error:num=21:unable to verify the first certificate
verify return:1

Certificate chain
0 s:/CN=nollivoipserver.nollicomm.net
i:/C=US/O=Let’s Encrypt/CN=R3