...
export async function getAppConfiguration(): Promise<AppConfiguration> {
  const conf: AppConfiguration = {
    ...
    auth: {
-     requireEmailVerification: process.env.AUTH_REQUIRE_VERIFICATION === "true",
-     requireOrganization: process.env.AUTH_REQUIRE_ORGANIZATION === "true",
-     requireName: process.env.AUTH_REQUIRE_NAME === "true",
+     requireEmailVerification: false, // your decision
+     requireOrganization: true,
+     requireName: true,
      ...

model User {
  ...
+ signers Signer[]
}

model Tenant {
  ...
+ signers Signer[]
}

model Signer {
  id       String    @id @default(cuid())
  rowId    String
  row      Row       @relation(fields: [rowId], references: [id], onDelete: Cascade)
- email    String
- name     String
+ tenantId String
+ tenant   Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
+ userId   String
+ user     User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  role     String
  signedAt DateTime?
}

+ export type SignerDto = {
+  id?: string;
+  tenant: { id: string; name: string };
+  user: { id: string; email: string; name: string };
+  role: string;
+  signedAt: Date | null;
+};

// ContractDto.ts
export type ContractDto = {
  ...
- signers: { id: string; email: string; name: string; role: string; signedAt: Date | null }[];
+ signers: SignerDto[];
  ...
};

// ContractCreateDto.ts
export type ContractCreateDto = {
  ...
- signers: { email: string; name: string; role: string }[];
+ signers: SignerDto[];
};

// ContractHelpers.ts
function rowToDto({ entity, row }: { entity: EntityWithDetails; row: RowWithDetails }): ContractDto {
  return {
    ...
    signers: row.signers.map((s) => {
      return {
        id: s.id,
-       email: s.email,
-       name: s.name,
+       tenant: { id: s.tenantId, name: s.tenant.name },
+       user: { id: s.userId, email: s.user.email, name: `${s.user.firstName} ${s.user.lastName}` },
        role: s.role,
        signedAt: s.signedAt,
      };
    }),
    ...
  }
}

// rows.db.server.ts
export type RowWithDetails = Row & {
  ...
- signers: Signer[];
+ signers: (Signer & { tenant: Tenant; user: UserSimple })[];
};

// rows.db.server.ts
export const includeRowDetails = {
  ...
- signers: true,
+ signers: { include: { tenant: true, user: { select: UserUtils.selectSimpleUserProperties } } },
};

// ContractRoutes.Edit.Api.ts
export namespace ContractRoutesEditApi {
  ...
  export let loader: LoaderFunction = async ({ request, params }) => {
    if (item.signatureRequestId) {
      ...
-     const contractSigner = item.signers.find((f) => f.email === currentUser!.email);
+     const contractSigner = item.signers.find((f) => f.user.id === currentUser?.id);
      ...
    }
  ...
  export const action: ActionFunction = async ({ request, params }) => {
    ...
    } else if (action === "signed") {
      ...
-     const signer = item?.signers.find((f) => f.email === user?.email);
+     const signer = item?.signers.find((f) => f.user.id === user?.id);
    ...

// ContractRoutes.New.Api.ts
...
+ import { SignerDto } from "../../dtos/SignerDto";
export namespace ContractRoutesNewApi {
  ...
  export const action: ActionFunction = async ({ request, params }) => {
    ...
    if (action === "create") {
      try {
        ...
-         const signers: { email: string; name: string; role: string }[] = form.getAll("signers[]").map((f: FormDataEntryValue) => {
-           return JSON.parse(f.toString());
-         });
+         const signers: SignerDto[] = form.getAll("signers[]").map((f: FormDataEntryValue) => {
+           return JSON.parse(f.toString());
+         });
        ...
-       const invalidSigners = signers.filter((f) => f.email === "" || f.name === "" || f.role === "");
+       const invalidSigners = signers.filter((f) => !f.tenant.id || !f.user.email || !f.user.name || f.role === "");
        ...

// ContractService.ts
...
export namespace ContractService {
  export async function create(data: ContractCreateDto, session: { tenantId: string | null; userId?: string }): Promise<ContractDto> {
    ...
-        return { email_address: signer.email, name: signer.name };
+        return { email_address: signer.user.email, name: signer.user.name }; 
    ...
-        email: signer.email,
-        name: signer.name,
+        tenantId: signer.tenant.id,
+        userId: signer.user.id,

// ContractRoutes.New.Api.ts
...
+ import { TenantUserWithDetails } from "~/utils/db/tenants.db.server";
+ import { LinkedAccountsApi } from "~/utils/api/LinkedAccountsApi";
export namespace ContractRoutesNewApi {
  export type LoaderData = {
    ...
+   possibleSigners: TenantUserWithDetails[];
  }
  export let loader: LoaderFunction = async ({ request, params }) => {
    ...
    const data: LoaderData = {
      ...
+     possibleSigners: await LinkedAccountsApi.getAllUsers(tenantId ?? "", {
+       includeCurrentTenant: true,
+     }),
    };