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Verify bot certificates?
I haven’t seen it mentioned in any docs or issues opened here, but it doesn’t seem to be possible to verify the bots certificates.
It also seems that when doing double-puppeting, certificates/devices are added to your account that cannot be verified.
I’m new to Matrix and not sure if this is a security issue, but some UIs mark the encrypted room as untrusted/less secure due to these issues?
You can do trust-on-first-use by just manually marking the device on the bridge bot as verified, other than that it can't currently be verified. (in element web: click on "1 session" -> click on session name -> manually verify by text)
It also seems that when doing double-puppeting, certificates/devices are added to your account that cannot be verified.
No, double puppeting does not add any e2ee devices.
I'm having this problem as well - already had the signal bridge running and only today enabled encryption. Now every time I send a message from within the signal client, it get's tagged with "Encrypted by an unverified session".
Would it break anything if I'd remove the existing Signal Bridge-Session from within my client and then restart the bridge?
I'd expect the "new unverified session" to pop up then, where I can manually verify, as stated by @tulir
I have verified the device via text but still gets unencrypted messages from the bot in the encrypted "management room"

Encrypting messages to the management room is not implemented. It reads them encrypted, but doesn't send encrypted messages back.