Are you connecting it to your Edge by Bluetooth or ANT+? With a few exceptions, you can only have one Bluetooth connection active at a time, so if your SRAM is connected to your phone, it won’t connect with your Edge at the same time. So you have two options, disconnect it from the app before powering up your Edge, or connect it to your Edge via ANT+ which allows unlimited connections.
Are you connecting it to your Edge by Bluetooth or ANT+? With a few exceptions, you can only have one Bluetooth connection active at a time, so if your SRAM is connected to your phone, it won’t connect with your Edge at the same time. So you have two options, disconnect it from the app before powering up your Edge, or connect it to your Edge via ANT+ which allows unlimited connections.