Gravatar-Image in Fairmeeting-Jitsi-Session

Hello,
thank you for providing your fairmeeting-server.
How can I use my Gravatar-Symbol in your Jitsi-Server?
In other Jitsi-Servers I only need to provide my gravatar-e-mailaddress and it shows up when I have no webcam.
Here it seems not to work and only my first Loginname-letter(s) appears, when I turn off my camera.
Keep up your good work,
Markus