Unauthorized client

[iPavel89-work]

Hello! I have own openhabcloud server. I want to create ifttt and yandex integration. I made service and tried to login by oauth2. i have this error
AuthorizationError: Unauthorized client
at validated (/home/ubuntu/cloud/openhab-cloud/node_modules/oauth2orize/lib/middleware/authorization.js:136:36)
at /home/ubuntu/cloud/openhab-cloud/routes/oauth2.js:111:20
at /home/ubuntu/cloud/openhab-cloud/node_modules/mongoose/lib/model.js:4866:16
at /home/ubuntu/cloud/openhab-cloud/node_modules/mongoose/lib/model.js:4866:16
at /home/ubuntu/cloud/openhab-cloud/node_modules/mongoose/lib/helpers/promiseOrCallback.js:24:16
at /home/ubuntu/cloud/openhab-cloud/node_modules/mongoose/lib/model.js:4889:21
at /home/ubuntu/cloud/openhab-cloud/node_modules/mongoose/lib/query.js:4399:11
at /home/ubuntu/cloud/openhab-cloud/node_modules/kareem/index.js:136:16
at processTicksAndRejections (internal/process/task_queues.js:77:11)
I need to add clients to my mondogb?