I've been offered a new job. My notice period is 3 months. The new company has just sent the contract through so I tried to leave my notice in today with HR. However, my manager has gone on a long period of annual leave a few days ago. HR have said they need to wait until I have spoken to my manager before they can accept the notice.
He's not back until the last week of August. What should I do? Should I just accept that I'm stuck and explain to the new company? I'm worried they won't want to wait.