Is the job I applied for on LinkedIn a scam? (US)

I applied for a remote job on LinkedIn recently. I received an email for an interview invite and they asked me to confirm my availability in order to proceed to the next steps. I replied to the email and they sent me a pdf with a Microsoft Teams link and an email address of a hiring manager. When I opened the link, it directed me to a chat with the manager rather than a scheduled time slot. I also looked up the hiring manager online but couldn't find any information on LinkedIn and neither was the job posting on the company's website. Do they want me to schedule the interview via email? Could that be a scam? What should I do? Should I just stop all of our communication? Thanks for the advice!