cosmos.azure.com doesn't load subscriptions when the user has access to more than 18,000 subscriptions

[kwill-MSFT]

In cosmos.azure.com if you sign in as a user that has access to more than 18,000 subscriptions then you are unable to select a subscription or database account. No error is shown in the portal, but the Subscription and CosmosDB Account Name dropdowns remain empty.

Network trace shows that Data Explorer is using Azure Resource Graph to query for microsoft.documentdb/databaseaccounts resources, and ARG fails with error:

{
"error": {
"code": "BadRequest",
"message": "Please provide below info when asking for support: timestamp = 2024-10-02T18:34:36.1937751Z, correlationId = 3217cea2-db7e-45d3-9c50-d2c459fe8be0.",
"details": [
{
"code": "TooManySubscriptionsUnderScope",
"message": "The number of subscriptions under provided tenant or management groups in the request has exceeded the allowed limit 18000. Please select a more granular scope or allow partial scopes results by passing AllowPartialScopes flag in the query options."
}
]
}
}