Debugging broken intellisense

[aureumleonis]

I'm working on a vcpp project on a windows server. I managed to almost get the setup to work except for some seemingly bizarre issues. Intellisense works perfectly in some files but fails in others. All of these files compile just fine with msbuild yet VS code sometimes reports stuff like these 2 errors over the same return type declaration RestProcessorBase* in virtual RestProcessorBase* GetRestProcessor() override

identifier "RestProcessorBase" is undefined
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class RestProcessors::RestProcessorBase
Abstract base for REST processors...

I find this fairly confusing as it seems like intellisense somehow complaints that RestProcessorBase doesn't exist but it also tells me it's declaration? I'm trying to understand what could be wrong with my setup.