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url access /wp-json/wplms/v1/user/ error 401 Unauthorize
If your site is on https then it may be possible that there might be some mod security on server that is not authenticating any call to server from app .
It seems like the https in your site is stripping the authorization code(a required parameter while making call to server) which is sent in headers .
Please check this source : https://github.com/gesellix/keepass-node/issues/9
and these relevant links : https://stackoverflow.com/questions/26549250/apache-strips-down-authorization-header
You need to allow access for authorization to stop stripping of the authorization code from headers .
Please contact your webhost on this .They would have to disable such mod security for this .