Acknowledgments The  Event Horizon Telescope Collaboration  thanks the following organizations and programs: the  Academia Sinica ; the  Academy of Finland  (projects  274477 ,  284495 ,  312496 ,  315721 ); the  Agencia Nacional de Investigación y Desarrollo (ANID) ,  Chile  via  NCN19 058  ( TITANs ) and  Fondecyt 1221421 , the  Alexander von Humboldt Stiftung ; an  Alfred P. Sloan Research Fellowship ;  Allegro , the  European ALMA Regional Centre node in the Netherlands , the NL astronomy research network NOVA and the astronomy institutes of the  University of Amsterdam ,  Leiden University , and  Radboud University ; the  ALMA North America Development Fund ; the  Black Hole Initiative , which is funded by grants from the  John Templeton Foundation  and the  Gordon and Betty Moore Foundation  (although the opinions  Bell Canada Graduate Scholarships -Doctoral Program ); the  National Youth Thousand Talents Program of China ; the  National Research Foundation of Korea  (the  Global  PhD Fellowship Grant: grants  NRF-2015H1A2A1033752 , the  Korea Research Fellowship Program :  NRF-2015H1D3A1066561 ,  Brain Pool Program :  2019H1D3A1A01102564 ,  Basic Research Support  Grant  2019R1F1A1059721 ,  2021R1A6A3A01086420 ,  2022R1C1C1005255 );  Netherlands Research School for Astronomy (NOVA) Virtual Institute of Accretion (VIA)  postdoctoral fellowships;  Onsala Space Observatory (OSO)  national infrastructure, for the provisioning of its facilities/observational support (OSO receives funding through the  Swedish Research Council  under grant  2017-00648 ); the  Perimeter Institute for Theoretical Physics  (research at  Perimeter Institute  is supported by the  Government of Canada  through the  Department of Innovation, Science and Economic Development  and by the  Province of Ontario  through the  Ministry of Research, Innovation and Science) ; the  Princeton Gravity Initiative ; the  Spanish Ministerio de Ciencia e Innovación  (grants  PGC2018-098915-B-C21 ,  AYA2016-80889-P ,  PID2019-108995GB-C21 ,  PID2020-117404GB-C21 ); the  University of Pretoria  for financial aid in the provision of the new Cluster Server nodes and  SuperMicro (USA)  for a SEEDING GRANT approved toward these nodes in 2020; the  Shanghai Pilot Program for Basic Research, Chinese   Academy of Science, Shanghai Branch  ( JCYJ-SHFY-2021-013 ); the  State Agency for Research of the Spanish MCIU  through the " Center of Excellence Severo Ochoa " award for the  Instituto de Astrofísica de Andalucía  ( SEV-2017-0709 ); the  Spinoza Prize   SPI 78-409 ; the  South African Research Chairs Initiative , through the  South African Radio Astronomy Observatory (SARAO , grant  ID 77948 ), which is a facility of the  National Research Foundation (NRF) , an agency of the  Department of Science and Innovation (DSI) of South Africa ; the  Toray Science Foundation ; the  Swedish Research Council (VR) ; the  US Department of Energy (USDOE)  through the  Los Alamos National Laboratory  (operated by  Triad National Security, LLC , for the  National Nuclear Security Administration  of the  USDOE , contract  89233218CNA000001 ); the  YCAA Prize Postdoctoral Fellowship ; and the  Astrophysics and High Energy Physics program  by  MCIN  (with funding from  European Union NextGenerationEU ,  PRTR-C17I1 ).