sasl troubleshooting

[Hugo Boss]

Hello
I try to setup a cyrus murder stack and I have issues to move mailboxes
between my 2 backends :
My stack :
2 frontends
1 mupdate
2 backends
When I try to move a mailbox between my 2 backends, I have a issue with
this message :
"sasl no worthy mechs found"
"Frontend couldn't authenticate to backend server"
The cyrus-sasl-plain has been installed.
I can move mailboxes in the same backend partitions

Thanks in advance.
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