Hello

Have an award booking ANA F in February with the following route CPH-LHR-HND-LHR-CPH - with a stop/transit of 20 hours in Haneda.

From what I have understand I can stay 24hour at HND if have an international onward flight.

Will there be any problems with my arrival and destination are the same? Would I have better odds if Instead did something like CPH-LHR-HND-LHR-MUC and the a separate ticket back to CPH?
I emailed ANA and got the following answer, but are still a bit worried that I might get denied boarding

"Thank you for your patience while we confirmed with Haneda airport agent regarding
your inquiry to return to London within the 24 hours after arrival.

According to Haneda, it is possible to stay in the terminal without entering Japan and
also access ANA lounge before departing on NH211. Since your trip is not till February,
please check for updated entry requirement close to your departure. If entry is
permitted, then you can leave the terminal and check in again for your inbound flight."