Hi @Ityumenev ,
can you check the value of MarketplaceURL
in your config.json
and make sure that your Mattermost application server is able to connec to it via https on the CLI? The expected results should look like this:
# mmctl --local config get PluginSettings.MarketplaceURL
"https://api.integrations.mattermost.com"
# curl https://api.integrations.mattermost.com
{"message":"Missing Authentication Token"}