Once you manually follow an artist they will be included in your Browse by Artist tile and event recommendations.

In order to refresh the artists from your connected music sources that the app follows, you need to rescan your music. Each time an artist is added or removed, your recommendations are recalculated.
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Rescan on iOS:

1. Tap the Profile page (person icon) at the bottom right
2. Tap on the Settings button (gear icon) at the top right
3. Scroll to Scan Music
4. Tap Start

Rescan on Android:

1. Tap the Profile page (person icon) at the bottom right
2. Tap on the Settings button (gear icon) at the top right
3. Select scan Music