This one is obvious, too. Look what happens when connecting via https:
$ openssl s_client -connect bridgingnursing.com:443 -servername bridgingnursing.com </dev/null
CONNECTED(00000003)
depth=1 C = US, O = DigiCert Inc, CN = DigiCert SHA2 Secure Server CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
0 s:/C=CA/ST=Ontario/L=North Bay/O=Nipissing University/CN=*.nipissingu.ca
i:/C=US/O=DigiCert Inc/CN=DigiCert SHA2 Secure Server CA
1 s:/C=US/O=DigiCert Inc/CN=DigiCert SHA2 Secure Server CA
i:/C=US/O=DigiCert Inc/OU=
You don't seem to have configured https for bridgingnursing.com, so redirecting from http to https confuses the ACME server.
I would recommend disabling http->https redirection for /.well-known/acme-challenge/