Add User to group in AAD through Runbook

So I have changed code little bit and I think it is able to connect but getting bad http request where it is getting
"$GroupObject = Get-AzureADGroup -All $true | where-object {$_.displayname -eq $EmailGroup} | select objectid"

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Failed
Error occurred while executing AddGroupMember
Code: Request_BadRequest
Message: Invalid object identifier '@{ObjectId=b4fdeec5-xxxx-xxxxx-xxx-xxxxxxx}'.
RequestId: 6bd5f2bd-f329-4541-b402-02f862463616
DateTimeStamp: Wed, 18 Dec 2019 23:12:49 GMT
HttpStatusCode: BadRequest
HttpStatusDescription: Bad Request
HttpResponseStatus: Completed
(Error occurred while executing AddGroupMember
Code: Request_BadRequest
Message: Invalid object identifier '@{ObjectId=b4fdeec5-xxxx-xxxxx-xxx-xxxxxxx}'.
RequestId: 6bd5f2bd-f329-4541-b402-02f862463616
DateTimeStamp: Wed, 18 Dec 2019 23:12:49 GMT
HttpStatusCode: BadRequest
HttpStatusDescription: Bad Request
HttpResponseStatus: Completed
)
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OUTPUT:
Logging in to Azure...

Account : e1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Environment : AzureCloud

Tenant : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TenantId : 5xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TenantDomain : brighthealthplan.com

eMAIL GROUP @{ObjectId=b4fdeec5-xxxxxxxxxxxxxxxxxxxxxx}

USER @{ObjectId=a870c179-xxxxxxxxxxxxxxxxxxxxxx}