No idea why nothing pops up... Try this other method then:
1. Download and install gameguardian
2. Grant it root perms and start it
3. Open the game and select the game's main process on gameguardian
4. Go on the 3 lines on the upper right corner then click on the 3 lines that appear in the toolbar and finally click memory dump
5. In range put 1 - any high value (e.g. 1 - 1000000), choose the path then click dump.
6. In the path you'll find a .bin and a .txt file, open the .txt file and search for the first line containing "libil2cpp.so"
7. you'll see 2 offsets, 1 for start and 1 for end. Go back to the game and do steps 3 and 4.
8. This time when dumping memory, put the offsets you saw earlier in the txt file. And dump again (better in a different path)
9. Go on
this website and scroll all the way down. On select executable, choose the .bin file that got created when you dumped the libil2cpp.so part of the memory.
10. When it tells you to select metadata, download the game's apk, unzip it and go to assets/bin/managed/metadata/global-metadata.dat and choose that file.
11. Now wait until it's done and download the dump.zip and unzip it
Dump.cs is the actual dump