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@Irina Azagra Thank you for reaching out to Microsoft Q&A. Sorry to hear that you are facing an issue with Dev Ops API.
Currently, Azure DevOps is not supported in Q&A forums. Please ask the experts in the dedicated Azure DevOps forum https://techcommunity.microsoft.com/t5/azure-devops/bd-p/AzureDevOpsForum and product group for DevOps/TFS can assist you with your question.
Supported products of Q&A forums are listed in https://learn.microsoft.com/en-us/answers/products/ (more to be added later).
If the response helped, do "Accept Answer" and up-vote it.