NextJS API route error for firestore: Deadline exceeded [duplicate] - firebase

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Firebase Cloud Functions: "4 DEADLINE_EXCEEDED: Deadline exceeded"
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google-cloud/firestore: Error: 4 DEADLINE_EXCEEDED: Deadline Exceeded while creating document
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I am trying to write to firestore database, but no success.
I am using firebase-admin version 11.3.0
I can read and write into firebase realtime database, but I can only read documents from firestore.
The nextJS API function is as below. As can be seen, I am trying to write 1 document with just a timestamp field.
export default async function handler(
req: NextApiRequest,
res: NextApiResponse
) {
const timestamp = Date.now()
const result = await admin.firestore().collection("Test").doc("doctest").set({timestamp: timestamp})
console.log("AWAIT: ", result.data())
return res.status(500).end()
}
The error I am getting is below:
error - Error: 4 DEADLINE_EXCEEDED: Deadline exceeded
at Object.callErrorFromStatus (/home/node/app/node_modules/#grpc/grpc-js/build/src/call.js:31:19)
at Object.onReceiveStatus (/home/node/app/node_modules/#grpc/grpc-js/build/src/client.js:195:52)
at Object.onReceiveStatus (/home/node/app/node_modules/#grpc/grpc-js/build/src/client-interceptors.js:365:141)
at Object.onReceiveStatus (/home/node/app/node_modules/#grpc/grpc-js/build/src/client-interceptors.js:328:181)
at /home/node/app/node_modules/#grpc/grpc-js/build/src/call-stream.js:188:78
at processTicksAndRejections (node:internal/process/task_queues:78:11)
for call at
at ServiceClientImpl.makeUnaryRequest (/home/node/app/node_modules/#grpc/grpc-js/build/src/client.js:163:34)
at ServiceClientImpl.<anonymous> (/home/node/app/node_modules/#grpc/grpc-js/build/src/make-client.js:105:19)
at /home/node/app/node_modules/#google-cloud/firestore/build/src/v1/firestore_client.js:225:29
at /home/node/app/node_modules/google-gax/build/src/normalCalls/timeout.js:44:16
at repeat (/home/node/app/node_modules/google-gax/build/src/normalCalls/retries.js:80:25)
at /home/node/app/node_modules/google-gax/build/src/normalCalls/retries.js:118:13
at OngoingCallPromise.call (/home/node/app/node_modules/google-gax/build/src/call.js:67:27)
at NormalApiCaller.call (/home/node/app/node_modules/google-gax/build/src/normalCalls/normalApiCaller.js:34:19)
at /home/node/app/node_modules/google-gax/build/src/createApiCall.js:84:30
at processTicksAndRejections (node:internal/process/task_queues:96:5)
Caused by: Error
at WriteBatch.commit (/home/node/app/node_modules/#google-cloud/firestore/build/src/write-batch.js:433:23)
at DocumentReference.set (/home/node/app/node_modules/#google-cloud/firestore/build/src/reference.js:391:27)
at handler (webpack-internal:///(api)/./pages/api/store/[storeid]/department/[depid]/product/[prodid].ts:51:132)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async Object.apiResolver (/home/node/app/node_modules/next/dist/server/api-utils/node.js:367:9)
at async DevServer.runApi (/home/node/app/node_modules/next/dist/server/next-server.js:476:9)
at async Object.fn (/home/node/app/node_modules/next/dist/server/next-server.js:738:37)
at async Router.execute (/home/node/app/node_modules/next/dist/server/router.js:252:36)
at async DevServer.run (/home/node/app/node_modules/next/dist/server/base-server.js:381:29)
at async DevServer.run (/home/node/app/node_modules/next/dist/server/dev/next-dev-server.js:732:20) {
code: 4,
details: 'Deadline exceeded',
metadata: Metadata { internalRepr: Map(0) {}, options: {} },
note: 'Exception occurred in retry method that was not classified as transient',
page: '/api/store/[storeid]/department/[depid]/product/[prodid]'
}
I haven't exceeded the limits of read and write. Actually, I have used less than 1% of read and write quota.
I could not say for sure that is the poor internet connection, because I can read and write into firebase realtime database. In addition, I can read documents from firestore.
How to overcome this issue?