Zyxel USG 100 - can't access with latest browsers - unsupported protocol

I have an old USG 100 in production and when I try to sign in from Microsoft Edge I get an error.

Unsupported protocol
The client and server don't support a common SSL protocol version or cipher suite.

I think this might be a lack of support on the USG for TLS1.2.

What can be done??

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