Exhibit 32.1

CERTIFICATION PURSUANT TO 

18 U.S.C. SECTION 1350, 

AS ADDED BY 

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Amendment No. 1 to Quarterly Report of MCAP Acquisition Corporation (the “Company”) on Form 10-Q/A for the quarterly period ended June 30, 2021, as filed with the Securities and Exchange Commission (the “Report”), I, Theodore L. Koenig, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as added by §906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. To my knowledge, the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of and for the period covered by the Report.

Date: October 29, 2021	By:	/s/ Theodore L. Koenig
		Theodore L. Koenig
		Chairman and Chief Executive Officer
		(Principal Executive Officer)