Vmware Discovery vm guest missing

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I have a zabbix 6.0 appliance download from website
We try to add my VCenter to discovery guest server , find some guest server missing in the zabbix monitor system. any suggest to troubleshooting it.

StartVMwareCollectors=25
VMwareFrequency=60
VMwarePerfFrequency=60
VMwareCacheSize=512M
VMwareTimeout=60