Reviewing the logs, this is what appears to me:
[2023-10-27 12:51:12.028] [info] ----------------- CMD RESULT ------------------
[2023-10-27 12:51:12.028] [info] cmd: telnet us.tlsgw.meraki.com 443
[2023-10-27 12:51:12.029] [info] timeout: 65000
[2023-10-27 12:51:12.029] [info] res: telnet us.tlsgw.meraki.com 443
[2023-10-27 12:51:12.029] [info] -------------------------------------------------------
[2023-10-27 12:52:11.088] [info] Client :: connection error Keepalive timeout
[2023-10-27 12:52:11.090] [info] Client :: connection close
[2023-10-27 12:52:11.090] [info] Client :: closed
[2023-10-27 12:52:51.873] [info] ----------------- CMD TIMEOUT ------------------
[2023-10-27 12:52:51.873] [info] cmd: telnet us.tlsgw.meraki.com 443
[2023-10-27 12:52:51.874] [info] timeout: 65000
[2023-10-27 12:52:51.874] [info] res: telnet us.tlsgw.meraki.com 443
[2023-10-27 12:52:51.874] [info] expects: [{"expect":{},"haltOnMatch":false,"matchedPromise":{}},{"expect":{},"haltOnMatch":false,"matchedPromise":{}}]
[2023-10-27 12:52:51.875] [info] -------------------------------------------------------
[2023-10-27 12:52:51.877] [info] Pre-check error occurred. Sending error to the UI [sw-894d05f0-75df-4ed9-8790-1cd138342626] A timeout occurred while waiting to verify configuration settings. Please try again.
[2023-10-27 12:52:51.897] [info] CLIENT_EVENT :: Client received device pre-check error [sw-894d05f0-75df-4ed9-8790-1cd138342626] {"id":"sw-894d05f0-75df-4ed9-8790-1cd138342626","error":"Error: A timeout occurred while waiting to verify configuration settings. Please try again."}
I tested with an all to all policy and it still gives me the error, my firewall is a fortigate