There is no migration and you can not use the same (sub)domain for dendrite you use for synapse. It breaks the federation. If you use matrix.domain.com for synapse, you need to use another domain for dendrite.
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I’m still running Synapse. Could I migrate this to Dendrite or others? Or would I have to just re-install and lose all messages…
No it’s not possible…
There is no migration and you can not use the same (sub)domain for dendrite you use for synapse. It breaks the federation. If you use matrix.domain.com for synapse, you need to use another domain for dendrite.
Oh too bad. I run it at h-y-p-e-r.space, so I’ll just continue to use Synapse for now. Don’t want to add a subdomain