When prefixing the toast with an alert(), the alert is show, as is a console.log() after the toast, so the toast is fired without errors, but no toast message is shown.

handleButtonClick() { 
  callApexController({ // }) 
  .then( result => { 
    console.log('Button Clicked'); // shows in console 
    const evt = new ShowToastEvent({ 
      title: 'Toasty Title', 
      message: 'My message', 
      variant: 'success', 
      mode: 'sticky' }); 
    this.dispatchEvent(evt); // never happens 
    alert('Boom!'); //shows 
  }) 
 .catch( error => { 
    console.log('Something went wrong'); 
    console.error(error); // logs to console correctly 
    const evt = new ShowToastEvent({ 
      title: 'Toasty Error Title', 
      message: 'My Error Message', 
      variant: 'sticky', 
    }); 
    this.dispatchEvent(evt); // never happens 
  }); 
  alert('Boom'); // alert shows 
} 

https://developer.salesforce.com/docs/component-library/bundle/lightning-platform-show-toast-event/documentation -> no mention of toast not working

https://developer.salesforce.com/docs/atlas.en-us.bi_dev_guide_lwc_in_db.meta/bi_dev_guide_lwc_in_db/bi_lwc_in_db_overview.htm -> no mention of toast not working

Looking at the Documentation:

• Platform Show Toast Event has no mention of toast not working/being supported for Tableau CRM Dashboards.
• Lightning Web Components in Tableau CRM Dashboards also makes no mention of toast not working/being supported.

When prefixing the toast with an alert(): the alert is shown, as is a console.log() after the toast (so the toast is fired without errors), but no toast message is shown.

 handleButtonClick() { 
   callApexController({ // }) 
   .then( result => { 
     console.log('Button Clicked'); // shows in console 
     const evt = new ShowToastEvent({ 
       title: 'Toasty Title', 
       message: 'My message', 
       variant: 'success', 
       mode: 'sticky' }); 
     this.dispatchEvent(evt); // never happens 
     alert('Boom!'); //shows 
   }) 
  .catch( error => { 
     console.log('Something went wrong'); 
     console.error(error); // logs to console correctly 
     const evt = new ShowToastEvent({ 
       title: 'Toasty Error Title', 
       message: 'My Error Message', 
       variant: 'sticky', 
     }); 
     this.dispatchEvent(evt); // never happens 
   }); 
   alert('Boom'); // alert shows 
 }