Hi @Reshmi_Mehta,
welcome to the UiPath forum.
Some questions
Example of my community setup. Pretty basic.
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Did you setup your Tenant in the Cloud platform and assigned licenses to it?
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Did you setup your Folder, Virtualmachine and robot in Orchestrator?
Create a folder (modern), add a robot to it
Then you would be able to connect it with the machinekey and cloud url
If not, please show us which steps you took, so we can point you to a right solution