I want to build one way bot, the bot will be sending notifications to MS teams channel. I was able to accomplish this as mentioned in this post Initiate Proactive Conversation with Bot Framework for Microsoft Teams without Teams-Context possible?. But I see service url is not same in activity for all the requests and in docs it mentioned that it may change. How can I able to get correct service url without user initiating the request first.
If first scenario is not possible, if we store service url first time user send message to bot , how do we know if it changes without checking service url in each activity request.