The total Conversion Goal count would exceed the account level limit

Question

Hello community, We have an issue creating conversions goals using Bing Ads API. Our structure is - Master/Parent account, inside which we create multiple accounts via API and create new UTag and conversions goals per each newly created account. Our code was working well for a while, but recently we started to get error: "The total Conversion Goal count would exceed the account level limit". Same time if we try to create conversions goals from Bing Ads UI in side same account it is working fine. It look like API limit is per Parent/Master account as it is not working for any new account. Can someone suggest any direction we can investigate this issue? Thanks in advance!