When I use client and bot scopes together I get the following error.
https://slack.com/oauth/authorize?scope=bot,client
Cannot request service scope (bot) with deprecated scopes.
It looks like the client scope is deprecated(even though I haven't seen any documentation for it). I can specify object scopes with the bot scope,
but I am not able to gather all the scopes that constitutes the compound scope client(especially the scopes for RTM).
The client scope is not deprecated, but is incompatible with the bot scope
Please note that certain scopes cannot be asked for in combination with each other. For instance, you cannot request both the bot scope and the client scope. When users arrive at an authorization page requesting invalid scope combinations, they'll see an ugly error stating something to this effect:
"OAuth error: invalid_scope: Cannot request service scope (bot) with deprecated scopes"
If you want to access the RTM API to build a client, request the client scope. If it is to build a Slack app using the RTM API, use the bot scope. Either one should be enough for your needs