trying to connect to the nrf cloud

Good Day,

Im a developer in switzerland using the nrf9160 trying to connect to the nrf cloud using mqtt, i have already flashed the credentials, updated the modems firmware and tied my api key tot he device. the following is the uart ouput that i get: 

[00:00:05.298,492] <inf> cloud_connection: Network connectivity gained!
[00:00:06.298,675] <inf> cloud_connection: Network is ready
[00:00:06.298,706] <inf> cloud_connection: Connecting to nRF Cloud
[00:00:11.065,307] <err> nrf_cloud_transport: MQTT input error: -128
[00:00:11.065,368] <err> nrf_cloud_transport: Error disconnecting from cloud: -128
[00:00:11.065,429] <inf> cloud_connection: Disconnecting from nRF Cloud
[00:00:11.065,460] <err> cloud_connection: Could not connect to nRF Cloud
[00:00:11.065,460] <inf> cloud_connection: Retrying in 30 seconds...

I would be gratefulifsomebody could point me in the right direction  to solve this issue.

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