Hope you are doing fine:
Let me ask you a few questions:
- Is this vSphere 6.7? Have you used flex client?
- Which browsers have you tied this?
- Are you using self signed or CA certificates?
Have you tried this?
1. Put ESXi in Maintenance Mode
2. Shut down and remove from inventory
3. Restart vCenter
4. Power on ESXi and check certificates.
5. Re connect ESXi host to vCenter