INVALID_CUSTOMER_ID when accepting a manager link request

[Ethan Crabb]

Hi there.
I'm getting this response when accepting a manager link request using 
*https://googleads.googleapis.com/v15/customers/${customer}/customerManagerLinks:mutate*

Invalid customer ID 'CUSTOMER_ID'.

The customer ID in question does *not *include hyphens, and comes directly 
from the Google Ads API itself.

Our flow is the following:
- Create an access link authenticating as the manager account
- Accept the access link as the client account using the generated 
*resourceName*

Here is the code:
await axios.post(`https://googleads.googleapis.com/v15/customers/${
agencyCustomerID}/customerClientLinks:mutate`, {
operation: {
create: {
status: "PENDING",
clientCustomer: `customers/${customer}`,
}
}
}, {
headers: {
"developer-token": process.env.GOOGLE_ADS_DEVELOPER_TOKEN,
Authorization: `Bearer ${accessToken}`
}
}).then((res) => {
// Now the link has been created, we'll accept it acting as the client 
https://developers.google.com/google-ads/api/rest/reference/rest/v15/customers.customerManagerLinks/mutate
const linkResourceName = res.data.result.resourceName
axios.post(`https://googleads.googleapis.com/v15/customers/${customer}
/customerManagerLinks:mutate`, {
operations: [
{
update: {
resourceName: linkResourceName,
status: "ACTIVE"
},
updateMask: "resourceName,status"
}
]
}, {
headers: {
"developer-token": process.env.GOOGLE_ADS_DEVELOPER_TOKEN,
Authorization: `Bearer ${accessToken}`
}
}).then(() => {
...
}).catch(err => {
// Error happens here
...
})
}).catch(err => {
...
})

Here is the full error message:
{
  error: {
    code: 400,
    message: 'Request contains an invalid argument.',
    status: 'INVALID_ARGUMENT',
    details: [
      {
        '@type': 
'type.googleapis.com/google.ads.googleads.v15.errors.GoogleAdsFailure',
        errors: [
          {
            errorCode: { requestError: 'INVALID_CUSTOMER_ID' },
            message: "Invalid customer ID 'CUSTOMER_ID'.",
            location: {
              fieldPathElements: [
                { fieldName: 'operations', index: 0 },
                { fieldName: 'update' },
                { fieldName: 'resource_name' }
              ]
            }
          }
        ],
        requestId: 'TtHTpWOPj-JKGQnjRq5y2w'
      }
    ]
  }
}

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