Accessing themeColorScheme leads to error in PowerPoint Online

[PaulBol]

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: Office on the web
• Host [Excel, Word, PowerPoint, etc.]: PowerPoint
• Office version number: latest
• Operating System: browser-based (Windows)
• Browser (if using Office on the web): Edge, Firefox

Expected behavior

I expect the following code to print the color code of the Accent 1 color, e.g., Accent1: #156082.

PowerPoint.run(async context => {
    if (Office.context.requirements.isSetSupported("PowerPointApi", "1.10")) {
        const masters = context.presentation.slideMasters;
        masters.load("items");
        await context.sync();

        const scheme = masters.items[0].themeColorScheme;
        await context.sync(); // <-- Error occurs here (or in second context.sync if commented out)

        const color = scheme.getThemeColor("Accent1");
        await context.sync();

        console.log(`Accent1: ${color.value}`);
    }
});

Current behavior

The code works as expected on PowerPoint on Windows.

In PowerPoint Online the context.sync() fails with: Uncaught (in promise) RichApi.Error: GeneralException

Steps to reproduce

1. Open Script Lab add-in > New
2. Paste code above and run
3. See output in add-in on Windows and error in browser console in PowerPoint Online

Link to live example(s)

n/a

Context

I want to determine if a textbox shape uses a theme color for the font. PowerPoint.ShapeFont.color only returns a hex color code, so I need to compare it with the theme colors.

Useful logs

n/a

[github-actions]

Regression Analysis Needs Your Input

Our automated system analyzed this issue but couldn't determine with confidence if this is a regression bug.

A regression bug is when functionality that previously worked properly no longer works after a recent change.

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[PaulBol]

I cannot tell for sure if it's a regression. themeColorScheme is part of the latest requirements set 1.10 which was released not too long ago. Maybe it never worked in PowerPoint Online.

[ElizabethSamuel-MSFT]

@PaulBol Thanks for letting us know about this.

@kustonaut Can you take a look?

Thanks.

[PaulBol]

Just wanted to check if you could confirm it's a bug or if I'm doing something wrong.

[PaulBol]

Any updates for this issue?