Zulu Android Mobile App certificate warning


I’m just setting up a new install for a client. It’s possible that in the future they may want to use Zulu so I
have installed the 2 user free license and got Zulu working for the PC desktop app. When I try to login to the Zulu Android app on my phone I get the error:

"Invalid Server Certificate"
"Zulu Mobile requires a trusted SSL Certificate to maintain a secure Connection. Your server’s certificate is invalid. Please contact your administrator and ask them to correct this issue"

For various reasons we use Sectigo (formerly Comodo) certificates and the installed certificate on this server is trusted by Chrome, IE, etc. On a previous install where we used Sangoma phones I seem to remember that they didn’t like Comodo certificates - could this be the same issue with Zulu Mobile ?

Thanks for reading,

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