530 Valid hostname is expected.

Looking for help with this response from ftptest.net...
Reply: 530 Valid hostname is expected.
Error: Login refused by server

Following are the details. I think the problem is that this certificate is for my website. Do I need another for my Ftp site?

Status: Resolving address of mickftpsite.com
Status: Connecting to 99.242.126.196
Warning: The entered address does not resolve to an IPv6 address.
Status: Connected, waiting for welcome message...
Reply: 220 Microsoft FTP Service
Command: CLNT https://ftptest.net on behalf of 2607:fea8:2e1d:ba00:11db:c25c:8d91:579f
Reply: 500 Command not understood.
Command: AUTH TLS
Reply: 234 AUTH command ok. Expecting TLS Negotiation.
Status: Performing TLS handshake...
Status: TLS handshake successful, verifying certificate...
Status: Received 2 certificates from server.
Status: cert[0]: subject='CN=mickwebsite.com' issuer='C=US,O=Let\27s Encrypt,CN=R3'
Status: cert[1]: subject='C=US,O=Let\27s Encrypt,CN=R3' issuer='C=US,O=Internet Security Research Group,CN=ISRG Root X1'
Command: USER mickftpsite.com|Mick
Reply: 530 Valid hostname is expected.
Error: Login refused by server

===Off Topic Question>>>

So, where is this mysterious save button that it keeps nagging me about but never shows anywhere!