As DA01 mentioned, the hex is for web; forget about it for printing.
The Pantone is a special ink for offset printing; it's more economical to use one ink toprint some projects than using the standard 4 inks combined that are used on most offset color printing projects. It doesn't matter if it's CVU, CVC or any letter after the name; the printer will use the same can of ink to print it anyway IF you print in Pantone 1-color.
The main issue is that your designer didn't provide a CMYK logo that you should use. So ask a designer to convert your logo to CMYK or do it yourself in Illustrator. Then stick to the same logo version and that CMYK color recipe for your office projects. If you need a hex color recipe, convert that CMYK recipe to hex instead of using the one in the guideline. Don't convert from hex to cmyk; convert from cmyk to hex. In yourcase, from pantone to cmyk, and then cmyk to hex.
It's normal your office printer will not render the color exactly the same; your software, for example Word, will not either. There's a few things along the way that will make it almost impossible for you to match perfectly your logo on every printer you'll use; sometimes the Pantone color recipe will be respected/matched, sometimes converted by the software and printer, sometime to something RGB, etc. That's why you need to stick to one version and the most reliable for office printing and most offset projects is CMYK on projects in full colors.
Unless you are yourself a designer, adjusting these versions to print all the same can be tricky. You'll probably need to do some trial and errors if you use software that don't have any color management system (eg. The Office Suite.)
The best you can do is to stick to a CMYK version of your logo and always use the same recipe every time. It will never be the same everywhere but you should see less variations than jumping from RGB hex to Pantone to CMYK randomly.
If you ARE the designer, than fix that guideline and update every logo
with the same version of Pantone and CMYK values; rename the swatches and make sure they have the same values. Prepare a set of CMYK, Pantone and RGB hex logo. Then use the right version depending on the project you work on. Someone will have to make a choice at some point and fix the guidelines! If you cannot do it yourself, hire a designer.
This is an example to show how online guides are not always precise with color conversions, and since you have different results, might as well set the guidelines yourself by reconverting your Pantone to CMYK and then RGB.
You can see there's different blue on the first row.
From the official Pantone Converter - Process Blue Coated:
Some info to convert Pantones here:
Mismatched CMYK Values
Pantone color conversions