[System Test] HTTP status 500 received from engageCluster2 API multiple times

[2021-03-10T17:00:40-08:00, sequoiatools/couchbase-cli:7.0:afafc5] server-add -c 172.23.97.74:8091 --server-add https://172.23.96.14 -u Administrator -p password --server-add-username Administrator --server-add-password password --services eventing

→  

Error occurred on container - sequoiatools/couchbase-cli:7.0:[server-add -c 172.23.97.74:8091 --server-add https://172.23.96.14 -u Administrator -p password --server-add-username Administrator --server-add-password password --services eventing]

docker logs afafc5

docker start afafc5

�ERROR: Prepare join failed. Got HTTP status 500 from REST call post to https://172.23.96.14:18091/engageCluster2. Body was: "[\"Unexpected server error, request logged.\"]"

{net_kernel,{'EXIT',<0.4272.182>,shutdown}}

[cluster:debug,2021-03-10T17:00:41.246-08:00,ns_1@172.23.97.74:ns_cluster<0.236.0>:ns_cluster:do_add_node_with_connectivity:836]Reply from engage_cluster on {"172.23.96.14",18091}:

{error,rest_error,

       <<"Got HTTP status 500 from REST call post to https://172.23.96.14:18091/engageCluster2. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>,

       {bad_status,500,<<"[\"Unexpected server error, request logged.\"]">>}}

[cluster:debug,2021-03-10T17:00:41.246-08:00,ns_1@172.23.97.74:ns_cluster<0.236.0>:ns_cluster:handle_call:361]add_node(https, "172.23.96.14", 18091, <<"0">>, ..) -> {error,engage_cluster,

                                                        <<"Prepare join failed. Got HTTP status 500 from REST call post to https://172.23.96.14:18091/engageCluster2. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>,

                                                        {error,rest_error,

                                                         <<"Got HTTP status 500 from REST call post to https://172.23.96.14:18091/engageCluster2. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>,

                                                         {bad_status,500,

                                                          <<"[\"Unexpected server error, request logged.\"]">>}}}

[user:info,2021-03-10T17:00:41.247-08:00,ns_1@172.23.97.74:<0.3911.182>:ns_cluster:add_node_to_group:89]Failed to add node 172.23.96.14:18091 to cluster. Prepare join failed. Got HTTP status 500 from REST call post to https://172.23.96.14:18091/engageCluster2. Body was: "[\"Unexpected server error, request logged.\"]"