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Connect to https://domain.
Enter your User ID/PW and click Login.
The following message appears:
Sorry, the SSL VPN server you are trying to reach is unavailable at this time. Please try again later.
What kind of problem is this?
Moving the post to appropriate product category for better results.
Technical Support Advisor - Premier Services
A definitive answer is difficult with this information. My guess is that you did not have compatible ciphers.
In Internet Options on your client are TLS1.2 and TLS1.3 allowed?
If you open a support case they can assist you in resolving this.