It should be noted that Microsoft had stopped developing new features or hardware for Windows 10 Mobile since 2017.
Once the equipment reaches the end of support, some of the features will slowly stop working.
Microsoft also stated that it will also be phasing out its built-in backup tool after the support ends.
Hence, the company is encouraging its users to manually create a backup before December 10, 2019.
source: www.techworm.net