Is this device compatible with Chalk.Whilst not listed on the immediate compatibility list, it is listed on ARCore site but with caveats.
Samsung Galaxy A7 (2018)
Ser. No. RF8M30YN9TW
Android Version 9
Baseband version: A750FNXXS4BTA4
Kernel Version: 4.4.111-16070901 #Sat Feb 1 14:38:41 KST 2020
What does this mean about OpenGL?
You can find a current list of all supported devices for Chalk here: https://chalk.vuforia.com/content/vuforia-chalk/en/download-chalk.html