I posted some time back about Play store was not updating on my Galaxy S9. I took it to the local Sprint store on Dodge St in Omaha and they got it going each time (3 separate visits), but the problem persisted. I finally figured something out. I have added a paid version of Lookout. Turns out that I have also added or Lookout added a VPN which activates automatically. When I disable that, Play store updates, so every so often, I manually disable it a to get Play store to update. Then the VPN automatically reactivates causing the backlog again. At least, I have a workaround.