You can collect all the logs via our support utility:
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C:\Program Files\Common Files\Veeam\Veeam ONE Settings\VeeamOneSettings.exe
Hmm...not sure that this problem is with the certificate, otherwise we would have more support issues on this. Anyway, try switching your vCenter Server to a default port, add its certificate to the Veeam ONE server and try to connect again.
BTW, can you please try any other account for the connection settings?