I think even if you enter at 4, if you use your party ticket you still will not be able to get FP+ between 4-7. I think you can only get FP+ with a regular day ticket. I am sure if I am wrong someone will come along and correct me.
Schedule your Fp+ using MDE for rides between 4-7. Enter the park using your hard, plastic party ticket and your Fp+ be on your MagicBand. Using your MagicBand at Fp+ tapstiles only accesses your Fp+, it doesn't interfere with ticket usage.
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