You may find that Omnichannel is missing from your list of Dynamics 365 Apps in the Power Platform Admin Center. For example, below is the Dynamics 365 Apps, but no Omnichannel:
If this is the case, try selecting an org first by clicking on Environments, then the org:
On the right, you will see Resources, then Dynamics 365 Apps:
You are now under the Dynamics 365 Apps for this org, and can see Omnichannel:
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