# The Encryption key error on MacOS - UE5.5 with FMOD 2.03.08

**URL:** <https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495>\
**Category:** Unreal Engine\
**Created:** [October 19, 2025, 9:49pm UTC](https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495 "2025-10-19T21:49:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![yihoe1](https://avatars.discourse-cdn.com/v4/letter/y/76d3ee/32.png) [@yihoe1](https://qa.fmod.com/u/yihoe1)\
**Post date:** [October 19, 2025, 9:49pm UTC](https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495/1 "2025-10-19T21:49:57Z")

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I’d like to report a bug found in Unreal Engine 5.5 and FMOD Studio 2.03.08.  
The issue is related to the Encryption Key on macOS.

When the Encryption Key is applied, audio in the banks cannot be read. The following errors appear in the log:

LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_oggvorbis.cpp(358) - failed to open as ogg  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_mod.cpp(1246) - ‘M.K.’ etc ID check failed [D??]  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_s3m.cpp(1546) - ‘SCRM’ ID check failed [???]  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_xm.cpp(2205) - 'Extended Module: ’ ID check failed [FAC/]  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_it.cpp(4093) - ‘IMPM’ etc ID check failed [FAC/]  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_midi.cpp(2859) - ‘HThd’ ID check failed [FAC/]  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/core\_api/src/fmod\_codec\_mpeg.cpp(481) - failed to open as mpeg  
LogFMOD: Error: /opt/teamcity-agent/work/c1c3f17eb167c494/studio\_api/src/fmod\_resource\_loader.cpp(620) - Failed to load waveform {3d2408d2-4ab3-473d-8668-71cff64123fc}

The same project works correctly and produces sound on Windows.  
However, if the Encryption Key is completely removed and the project is rebuilt on macOS, the sound plays normally again.

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**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\
**Post date:** [October 20, 2025, 6:32am UTC](https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495/2 "2025-10-20T06:32:43Z")

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Hi,

Thank you for bringing this to our attention.

I have been able to reproduce the issue and have passed it into our development team to investigate further.

Unfortunately, I do not have a workaround at the current time.

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**Author:** ![dquartz](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/dquartz/32/4978_2.png) [@dquartz](https://qa.fmod.com/u/dquartz)\
**Post date:** [April 15, 2026, 2:10am UTC](https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495/3 "2026-04-15T02:10:49Z")

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I just ran into this same issue in Unreal Engine 5.6 with FMOD Studio 2.03.08, but on Windows in the Editor. I see that this issue was fixed on 2.03.12 for Mac. Can you confirm that the issue also affected Windows and the fix in 2.03.12 addresses that as well?

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<div class="post-metadata">

**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\
**Post date:** [April 16, 2026, 12:39am UTC](https://qa.fmod.com/t/the-encryption-key-error-on-macos-ue5-5-with-fmod-2-03-08/23495/4 "2026-04-16T00:39:47Z")

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Hi, I can confirm that it was solved for Windows as well.