Add case for multiple users

[fforres]

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	86.27%	20061 / 23252
🔵	Statements	86.27%	20061 / 23252
🔵	Functions	79.87%	516 / 646
🔵	Branches	80.9%	1576 / 1948

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/schema/invitations/mutations.ts	85.77%	87.5%	100%	85.77%	48-49, 144-149, 154-159, 222-243
src/schema/purchaseOrder/helpers.ts	89.26%	53.84%	100%	89.26%	58-59, 67-68, 73-74, 79-80, 85-86, 141-146

Generated in workflow #1385 for commit 4434b3c by the Vitest Coverage Report Action