I'm unsure how much access you have to the locked Answer @zaki-amiri so I'm including it here for your reference:
Zaki, could you take the following outline and gather the info I'm requesting and update your question to include it so I can work through the possible root causes of what's generating those 404 errors? I'll update the answer with the full explanation once I"Ve had a chance to review your response.
===== COPY BELOW & ADD TO QUESTION =====
Here's the information about my environment that will assist in identifying the root cause of this error: