The coalescing operator is not working

The coalescing operator (?? and ??=) is only supported in C# 8.0 or later. Unity Playworks Plugin uses the Bridge.NET library that currently only supports up to C# 7.0.

Possible solutions:

• Use Unity Playworks Plugin Compiler V2 to compile your build. This will allow you to use C# 8.0 or 9.0 features.