How to sum values calculated in 5 Custom Fields in another Custom Field

[Bola Oye]

I have 5 Custom Fields and each Custom Field is being used to calculate the Monthly Payment. The default value is set at 0 for all the Custom Fields. When the Workflow transitions to Active the following values are correctly generated

e.g.

Monthly Payment A = 10

Monthly Payment B = 15.67

Monthly Payment C =12

Monthly Payment D = 15

Monthly Payment E = 20

I have created another Custom Field - Monthly Total which is to sum the 5 above.

I am using the Automation Rule

When the Value changes for 

Monthly Payment A, Monthly Payment B, Monthly Payment C, Monthly Payment D  

Monthly Payment E

And: Edit issue fields 

Monthly Total

{{#=}}{{issue.Monthly A|0}}  + {{issue.Monthly B|0}} + {{issue.Monthly C|0}} + {{issue.Monthly D |0}} + {{issue.Monthly E|0}}{{/}}

I am not getting any result.  What am I missing?

[teilor_soares]

The URL you are using is correct. Just tested with my cloud instance and got back the expected feeds in my browser.

Maybe you are having some problem with user permissions. Did you try use the admin user in your URL?

Cheers!
Teilor