diff --git a/apps/api/src/oidc/oidc-interaction.controller.ts b/apps/api/src/oidc/oidc-interaction.controller.ts
index cc0caae..ffdacce 100644
--- a/apps/api/src/oidc/oidc-interaction.controller.ts
+++ b/apps/api/src/oidc/oidc-interaction.controller.ts
@@ -1,4 +1,4 @@
-import { Body, Controller, Get, Param, Post, Req, Res, UnauthorizedException } from '@nestjs/common';
+import { Body, Controller, Get, Logger, Param, Post, Req, Res, UnauthorizedException } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { Request, Response } from 'express';
 import type { Interaction } from 'oidc-provider';
@@ -9,6 +9,8 @@ import { OidcProviderService } from './oidc-provider.service';
 
 @Controller('interaction')
 export class OidcInteractionController {
+  private readonly logger = new Logger(OidcInteractionController.name);
+
   constructor(
     private readonly oidc: OidcProviderService,
     private readonly config: ConfigService,
@@ -22,7 +24,10 @@ export class OidcInteractionController {
     try {
       details = await this.oidc.interactionDetails(request, response);
     } catch (error) {
-      await this.logInteractionSessionError(error, uid, request);
+      this.logInteractionSessionError(error, uid, request).catch((logError) => {
+        const message = logError instanceof Error ? logError.message : String(logError);
+        this.logger.error(`OIDC interaction session logging failed: ${message}`);
+      });
       response
         .status(400)
         .send(
@@ -217,6 +222,12 @@ export class OidcInteractionController {
 
   private async logInteractionSessionError(error: unknown, uid: string, request: Request): Promise<void> {
     const cookieHeader = request.headers.cookie ?? '';
+    const hasCookieHeader = Boolean(cookieHeader);
+    const hasInteractionCookie = /(?:^|;\s*)_interaction=/.test(cookieHeader);
+    this.logger.warn(
+      `OIDC interaction session not found uid=${uid} hasCookieHeader=${hasCookieHeader} hasInteractionCookie=${hasInteractionCookie} host=${request.headers.host ?? ''} forwardedProto=${request.headers['x-forwarded-proto'] ?? ''}`,
+    );
+
     await this.applicationErrorLogger.log({
       error,
       category: ApplicationErrorCategory.OIDC,
@@ -232,8 +243,8 @@ export class OidcInteractionController {
       },
       context: {
         uid,
-        hasCookieHeader: Boolean(cookieHeader),
-        hasInteractionCookie: /(?:^|;\s*)_interaction=/.test(cookieHeader),
+        hasCookieHeader,
+        hasInteractionCookie,
         forwardedProto: request.headers['x-forwarded-proto'],
         forwardedHost: request.headers['x-forwarded-host'],
         host: request.headers.host,