[1] On 17 March 2021 night local time, BWF stated that all Indonesian players competing in the tournament, including all three who had won in the first round, were withdrawn from the tournament after 20 of 24 people from the team were contacted by the NHS Test and Trace service via e-mail, and were required to enter 10-day isolation.

They were contacted by the NHS after someone on the same inbound flight from Istanbul to Birmingham with the team was tested positive for COVID-19.

[9] The Badminton Association of Indonesia (PBSI) also stated that Turkish badminton player Neslihan Yiğit and her trainer who were on the same flight with the Indonesian team from Istanbul to Birmingham, but Yiğit was allowed to continue her tournament.

[10] On 18 March noon local time, Yiğit was announced to had also been withdrawn from the tournament by the BWF.

[11] Earlier, the first round of the men's doubles between Indonesians Mohammad Ahsan and Hendra Setiawan and English pair Ben Lane and Sean Vendy sparked backlashes because of an arrangement where the service judge on duty, Alan Crow, was also English.